247 research outputs found
About some exact solutions for 2+1 gravity coupled to gauge fields
Some exact static solutions for Einstein gravity in 2+1 dimensions coupled to
abelian gauge field are discussed. Some of these solutions are
three-dimensional analogs of the Schwarzschild black holes. The metrics in the
regions inside and outside the horison are connected by the changing of the
Planck mass sign.Comment: 10 page
DBI Action from Closed Strings and D-brane second Quantization
Brane-like vertex operators play an important role in a worldsheet
formulation of D-branes and M-theory. In this paper we derive the DBI D-brane
action from NSR closed string sigma-model with brane-like states. We also show
that these operators carry RR charges and define D-brane wavefunctions in a
second quantized formalism.Comment: 16 pages, latex, typos corrected, BRST nontriviality condition (9)
for closed string vertices is amende
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